HydroBASINS lev08 watershed · #2080569110
Bassin du Tarn
A watershed (drainage basin) is not a body of water — it is the land area where rainfall converges towards a single river that eventually reaches the sea (or an endorheic basin). Boundaries follow ridgelines.
Crosses 3 administrative regions : Haute-Garonne, Tarn, Tarn-et-Garonne
Sub-basin area
993,4km²
Upstream area
9 748,3km²
Discharge
142,24m³/s
Mean elev.
150m
Administrative coverage
Species present
4 740 distinct species · 175 317 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 41 species (selected proportionally per kingdom among those with at least one documented interaction here) to keep the graph readable. Hover for details, click to explore the full ecosystem of a species.
ℹ️ The territory contains many more species than displayed and all their documented interactions: the graph is intentionally the structural skeleton (top-N species by composite local score, edges filtered by Serrano 2009 disparity filter α=0.2).
Indicateurs du tissu écologique
Tissu écologique de Bassin du Tarn : 37 espèces + 4 bulles famille, 68 interactions GloBI documentées sur 5 types (connectance 8.3%, filtre Serrano α=0.2). Les 4 bulles regroupent des espèces visuellement absorbées par famille (≥3 espèces visibles).
Comparaison sur la connectance du réseau local complet vs distribution nationale (toutes les communes françaises).
Hydroclimate (BasinATLAS lev08)
Mean T°
12,8°C
Annual rain
730mm
Moisture idx (CMI)
-0,26
Runoff
243mm/an
PET
989mm
AET
617mm
Mean slope
2,6°
Water table
177cm
Forest
5%
Crops
84%
Urban
4%
Protected
0%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)